Write the chemical formulas for these polyatomic ions · Slide 6of 51 6. Applythe rules for naming...

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• Write the chemical formulas for these polyatomic ions:

1. sulfate

2. phosphate

3. carbonate

4. hydroxide

5. nitrate

6. ammonium

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• Answers:1. SO4

2‐

2. PO43‐

3. CO32‐

4. OH‐

5. NO3‐

6. NH4+

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• Worksheet: Section 9.2, 1‐6• Read 9.3

© Copyright Pearson Prentice Hall

Slide 5 of 49

Naming and Writing Formulas for Ionic Compounds

A recipe is a formula for the sauce—a complete list of ingredients and their proportions. Chemistry also uses formulas. Once you know the rules, you can write the formula for any chemical compound.

9.2

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6. Apply the rules for naming and writing formulas for binary ionic compounds.

7. Apply the rules for naming and writing chemical formulas for compounds with polyatomic ions (tertiary ionic compounds)

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>Naming and Writing Formulas for Ionic Compounds

Binary Ionic Compounds


How are the names of binary ionic compounds determined?

How do you write the formulas for binary ionic compounds?

9.2

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• Memorize ALL the rules for each day’s lesson as you go along or you will be in danger of getting lost by the end of the chapter!

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• Naming and Writing Binary Ionic Compounds– Composed of two elements: – Ionic compounds and molecular compounds are

named differently!!!– Ionic compounds

• The charges MUST BALANCE• Write metal ion first• Roman Numerals = charge of ion• Reduce to lowest whole number ratio

– Molecular compounds (preview of tomorrow)• Charges do not balance (they do not form ions; they

share electrons)• Prefixes signify the number of each atom in the

compound

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• Steps:1. Write the ions with their charges2. Balance the charges by adjusting the

subscripts (criss‐cross method)3. DO NOT WRITE CHARGES IN YOUR FINAL

ANSWER

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• How would you write the formula for Iron (III) oxide?– Fe2O3


Slide 12 of 51

Which of the following is a nonmetal?

A. iron

B. silver

C. oxygen

D. copper


Slide 13 of 51

What is the chemical formula for sodium chloride?

A. NaCl

B. Na2Cl2C. ClNa

D. Cl2Na2


Slide 14 of 51

What is the chemical formula for lithium oxide?

A. LiO2

B. Li2O

C. OLi2D. O2Li


Slide 15 of 51

What is the chemical formula for cesium sulfide?

A. CsS2B. Cs2S

C. CsS

D. S2Cs


Slide 16 of 51

What is the chemical formula for strontium oxide?

A. SrO2

B. SrO

C. Sr2O

D. OSr

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• Naming binary ionic compounds1. Write the metal cation first2. Add the –ide suffix to the non‐metal anion3. If there is a transition metal cation or Pb or Sn

be sure to determine the charge on the ion and write the correct Roman numeral. • Cadmium (Cd), Zinc (Zn), and Silver (Ag) do not need Roman numerals because they only form one ion.


Slide 18 of 51

What is the name of CuS?

A. copper sulfur

B. copper sulfide

C. copper(II) sulfide

D. copper(I) sulfide


Slide 19 of 51

What is the name of Cu2O?

A. copper oxygen

B. copper oxide

C. copper (II) oxide

D. copper (I) oxide


Slide 20 of 51

What is the name of SnF2A. tin fluorine

B. tin fluoride

C. tin (II) fluoride

D. tin (I) fluoride

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Tin(II) sulfide, or SnF2, is added to toothpastes to prevent cavities.

9.2


Slide 22 of 51

What is the name of SnS2A. tin sulfur

B. tin sulfide

C. tin (II) sulfide

D. tin (IV) sulfide

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Tin(IV) sulfide, or SnS2, is used in glazes for porcelain fixtures and dishes.

9.2

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• Writing ionic compound formula units– Non‐metal ions end in –ide– If there is a transition metal with more than

one charge you MUST use a Roman numeral. Including Sn and Pb, excluding Ag, Cd, Zn

– Remember the Roman numeral determines the CHARGE of the ion, not the number of ions in the compound

– YOU MUST determine the charge of the cation BEFORE writing a Roman numeral

– Group 1A‐3A cations (+ Ag, Cd, Zn)do NOT need a Roman numeral

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• Compounds with polyatomic ions1. Write ion & polyatomic ions with their

charges2. Balance the charges of the ions3. Put parentheses around the polyatomic ion

if you need more than one to balance the charge. Do not use parentheses if you need only one polyatomic ion.

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• Example– magnesium hydroxide

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• Naming compounds with polyatomic ions– You must recognize the polyatomic ion

– Determine charge of anion to figure out Roman numeral (charge) for transition metals

– Learn your flashcards

– Example: K2CO3

• potassium carbonate


Slide 28 of 51

What is the name of AlF3?

A. aluminum fluoride

B. aluminum fluorine

C. aluminum(I) fluorine

D. aluminum(II) fluoride


Slide 29 of 51

What is the name of FeS?

A. Iron sulfur

B. Iron sulfide

C. Iron(II) sulfide

D. Iron(III) sulfide


Slide 30 of 51

What is the name of CaO?

A. calcium oxide

B. calcium(I) oxide

C. calcium(II) oxide

D. calcium oxygenide


Slide 31 of 51

What is the name of Fe2O3?

A. iron oxide

B. iron(I) oxide

C. iron(II) oxide

D. iron(III) oxide

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Hematite, a common ore of iron, contains iron (III) oxide. The balanced formula is Fe2O3.

9.2

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• What is the formula for sodium hydroxide? – NaOH

• Magnesium Phosphate?–Mg3(PO4)2


Slide 34 of 51

What is the correct formula for potassium sulfate?

A. KSO4

B. K2SO4

C. K(SO4)

D. K(SO4)2


Slide 35 of 51

What is the correct formula for calcium carbonate?

A. CaCO3

B. Ca(CO3)

C. Ca2(CO3)

D. Ca(CO3)2

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Compounds With Polyatomic Ions

Oysters produce calcium carbonate to form their shells and sometimes pearls.

9.2


Slide 37 of 51

Use table 9.3 on page 257:

What is the correct formula for sodium hypochlorite

A. NaClO

B. Na2ClO

C. Na(ClO)1D. Na(ClO)2

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Sodium hypochlorite (NaClO) is used as a disinfectant for swimming pools. The metallic cation in this compound is sodium (Na+) so the polyatomic ion must be ClO–.

9.2


Slide 39 of 51

Use table 9.3 on page 257:

What is the correct formula for tin (IV) dichromate?

A. SnCr2O7

B. Sn2Cr2O7

C. Sn2 (Cr2O7)

D. Sn(Cr2O7)2

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• Naming compounds with polyatomic ions– You must recognize the polyatomic ion

– Determine charge of anion to figure out Roman numeral (charge) for transition metals

– Learn your flashcards

– Example: K2CO3

• potassium carbonate


Slide 41 of 51

What is the name of Li2CO3?

A. lithium carbon nitride

B. lithium carbonate

C. lithium cyanide


Slide 42 of 51

Name PbSO4

A. lead sulfate

B. lead(I) sufate

C. lead(II) sulfite

D. lead(II) sulfate

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Lead(II)sulfate is an important component of an automobile battery.

9.2


Slide 44 of 51

What is the name of Al(OH)3?

A. aluminum oxyhydride

B. aluminum hydrogen oxide

C. aluminum hydroxide


Slide 45 of 51

Name Sn3(PO4)2

A. selenium potassium oxide

B. tin phosphate

C. tin phosphide

D. tin (II) phosphate


Slide 46 of 51

What is the name of Na2CO3?

A. sodium carbonate

B. disodium carbonate

C. sodium chromate

D. sodium(II) carbonate


Slide 47 of 51

What is the name of (NH4)2CO3?

A. nitrogen hydrocarbonate

B. nitrogen hydrogen carbonate

C. ammonium carbonate


Slide 48 of 51

What is the charge of the ion of sulfur?

A. 2+

B. 1‐

C. 2‐

D. 0


Slide 49 of 51

Which of the following is NOT a cation?

A. iron(III) ion

B. calcium ion

C. sulfate

D. mercurous ion


Slide 50 of 51

An ‐ate or ‐ite at the end of a compound name usually indicates that the compound contains ____.

A. fewer electrons than protons

B. only two elements

C. neutral molecules

D. a polyatomic anion

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• Read 9.3• WS: Practice Problems 9.2, Qs 1‐6

Write the chemical formulas for these polyatomic ions · Slide 6of 51 6. Applythe rules for naming...

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